Protective helmet



FIG. 1 is a front perspective view of a protective helmet showing ournew design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a left side elevational view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

We claim the ornamental design for a protective helmet, as shown anddescribed.